Dec 20, 2012 12:12 PM

I found this on a beach in weymouth its very heavy please can anyone tell me what it could be? i can see it might have some iron in it from the orange rust but it also has a rainbow blue affect too when wet.

The pale glassy mineral is probably quartz. That could indicate that the rock came from a complex vein - a crack in the rocks filled with different sorts of minerals to the adjacent rocks, formed at a later date. Such metallic-mineral-rich veins are often associated with volcanic areas - which Weymouth is not. I suspect your rock may have come from somewhere else originally.